Multi-target net472, netstandard2.0 & net8.0 (#907)

* Multi-target netstandard2.0 & net8.0

* Also target net472

Author: louis-z

NGitLab/GitLabException.cs

@@ -1,7 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Net;
+#if !NET8_0_OR_GREATER
 using System.Runtime.Serialization;
+#endif
 using NGitLab.Impl;
 
 namespace NGitLab;
@@ -26,12 +28,14 @@ public GitLabException(string message, Exception inner)
     {
     }
 
+#if !NET8_0_OR_GREATER
     protected GitLabException(
         SerializationInfo info,
         StreamingContext context)
         : base(info, context)
     {
     }
+#endif
 
     /// <summary>
     /// The error code returned from the server.

NGitLab/NGitLab.csproj

@@ -1,24 +1,35 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>net472;netstandard2.0;net8.0</TargetFrameworks>
+    <!-- Keep "WebRequest is obsolete" as a warning -->
+    <WarningsNotAsErrors>$(WarningsNotAsErrors);SYSLIB0014</WarningsNotAsErrors>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' != 'net8.0'">
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
     <PackageReference Include="PolySharp" Version="1.15.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
     <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <Reference Include="System.Net.Http" Condition="'$(TargetFramework)' == 'net472'" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <AdditionalFiles Include="PublicAPI/$(TargetFramework)/PublicAPI.Shipped.txt" />
+    <AdditionalFiles Include="PublicAPI/$(TargetFramework)/PublicAPI.Unshipped.txt" />
   </ItemGroup>
 
   <ItemGroup>
     <InternalsVisibleTo Include="NGitLab.Mock" />
     <InternalsVisibleTo Include="NGitLab.Tests" />
   </ItemGroup>
-</Project>
+</Project>

NGitLab/PublicAPI.Shipped.txt …b/PublicAPI/net472/PublicAPI.Shipped.txtNGitLab/PublicAPI.Shipped.txt renamed to NGitLab/PublicAPI/net472/PublicAPI.Shipped.txt NGitLab/PublicAPI.Shipped.txt renamed to NGitLab/PublicAPI/net472/PublicAPI.Shipped.txt

@@ -0,0 +1 @@
+

NGitLab/PublicAPI.Unshipped.txt …PublicAPI/net472/PublicAPI.Unshipped.txtNGitLab/PublicAPI.Unshipped.txt renamed to NGitLab/PublicAPI/net472/PublicAPI.Unshipped.txt NGitLab/PublicAPI.Unshipped.txt renamed to NGitLab/PublicAPI/net472/PublicAPI.Unshipped.txt

@@ -0,0 +1 @@
+